1. Institute of Social Medicine and Epidemiology, University of Lübeck , Ratzeburger Allee 160, 23538 Lübeck , Germany
2. Department of Electrophysiology, Heart Center Leipzig at University of Leipzig , Leipzig , Germany
3. Leipzig Heart Institute , Russenstraβe 69A, 04289 Leipzig , Germany
4. The Clinical Research Institute , Munich , Germany
5. Department of Medicine and Health Services Research, BARMER , Wuppertal , Germany